Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm
Tubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Other, of circular cross section, of other alloy steel: > Other: > Other: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters > Other: > Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Effective with respect to entries on or after September 27, 2024, articles the product of China, as provided for in subdivision (b) of U.S. note 31 to this subchapter
Products classified under HTS 7304.59.20.70
P91 Feedwater Heater Seamless Pipe
P91 modified martensitic alloy seamless tube, 324.9 mm OD for feedwater heaters. Classified HTS 7304.59.20.70 for feedwater heater use, alloy steel, seamless, OD compliant.
SA-213 TP304 Seamless Boiler Tube
Seamless tube made from TP304 austenitic stainless steel alloy, with an outside diameter of 355.6 mm (14 inches), designed specifically for high-pressure boiler applications. It falls under HTS 7304.59.20.70 due to its seamless construction, circular cross-section, alloy steel composition, and suitability for use in boilers, with OD between 285.8 mm and 406.4 mm.
SA-335 P11 Seamless Superheater Tube
Seamless low-alloy steel tube grade P11 (1.25% chromium, 0.5% molybdenum) with 12-inch (304.8 mm) OD, engineered for superheaters in power generation boilers. Classified under HTS 7304.59.20.70 for its alloy steel makeup, boiler suitability, and specified diameter range.
SA-213 TP316L Heat Exchanger Tube
Low-carbon TP316L stainless alloy seamless tube, 15-inch (381 mm) OD, optimized for heat exchangers and condensers in chemical processing plants. It meets HTS 7304.59.20.70 criteria as other alloy steel, seamless, circular, for heat exchangers, within the 285.8-406.4 mm OD range.
SA-335 P22 Feedwater Heater Tube
High-temperature P22 alloy steel (2.25% Cr, 1% Mo) seamless tube, 13.5-inch (342.9 mm) OD, for feedwater heaters in steam cycles. Fits HTS 7304.59.20.70 as seamless other alloy steel tube for feedwater heaters, OD 285.8-406.4 mm.
SA-213 T9 Condenser Alloy Tube
T9 grade (9% chromium) seamless alloy steel tube with 11.5-inch (292.1 mm) OD for condensers in fossil fuel plants. HTS 7304.59.20.70 applies for its seamless, circular, condenser-suited design in other alloy steel, precise OD range.
P5 Alloy Seamless Refining Furnace Tube
ASME SA-335 P5 (5% Cr, 0.5% Mo) seamless tube, 14-inch (355.6 mm) OD, for refining furnace tubing in petrochemical refineries. Classified in HTS 7304.59.20.70 for refining furnace suitability, alloy steel, seamless, 285.8-406.4 mm OD.
Grade T91 Superheater Seamless Tube
Advanced T91 (9% Cr, 1% Mo, V-modified) seamless alloy tube, 15.75-inch (400 mm) OD for modern ultra-supercritical superheaters. Meets HTS 7304.59.20.70 as other alloy steel, seamless, superheater-suited, within OD limits.
P9 Chromium-Moly Boiler Tube
SA-335 P9 seamless tube (9% Cr, 1% Mo), 12.75-inch (324 mm) OD for boiler pressure parts. HTS 7304.59.20.70 due to alloy steel, seamless construction, boiler application, and diameter specification.
TP347H Heat Exchanger Alloy Tube
Stabilized TP347H seamless alloy tube, 16-inch (406 mm max) OD for high-temp heat exchangers. Falls under HTS 7304.59.20.70 as other alloy steel tube for heat exchangers, precise OD range.